"No place in our party for white supremacists," Tanya Granic Allen said on Twitter.

Ontario Progressive Conservative leadership candidate Tanya Granic Allen is seen at TVO studios in Toronto on Feb. 15, 2018 after a debate.

A candidate for the leadership of Ontario's Progressive Conservative party says she strongly condemns a white nationalist who endorsed her campaign.

Paul Fromm tweeted his support for Tanya Granic Allen on Friday. Fromm is the founder of several white supremacist organizations and has worked with the U.S.-based Council of Conservative Citizens. Dylann Roof, who murdered nine black churchgoers in South Carolina in 2015 with the intention of starting a race war, cited the group as an inspiration.

When I heard that this KKK guy mentioned by @TorontoStar had some affiliation with the PC Party I was horrified. Good news - it's not true! KKK guy not a PC member. No place in our party for white supremacists. #onpoli#PCPOLdr

She also denied that Fromm holds a PC party membership, a claim made by Caroline Mulroney, one of her rival contenders in the leadership race.

"Outraged to see white nationalist Paul Fromm involved in our leadership race," Mulroney wrote on Twitter. "My campaign will challenge his membership. There is room for many different viewpoints in our party, but not racist ones. I call on Tanya and all candidates to join me in denouncing his involvement."

Granic Allen also called out Mulroney for using Fromm's name.

"Caroline Mulroney should not be giving a platform and attention to a KKK guy by mentioning his name which I refuse to do," she said.

Caroline Mulroney should not be giving a platform and attention to a KKK guy by mentioning his name which I refuse to do. #onpoli#PCPOLdr